C20D9 Diagnostic Trouble Code

C20D9 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C20D9 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

Process Tips

Diagnostic trouble code C20D9 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C20D9.

Fortunately, C20D9 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C20D9 Trouble Code For Specific Cars

C20D9 Kaiser Six Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Short To Ground
C20D9 Hommell Berlinette Pressure Control Solenoid A Control Circuit / Open
C20D9 Subaru Legacy 4 Left Rear Turn Lamp Circuit Failure
C20D9 Porsche Boxster Type 987 Fuel Pressure Regulator 1 Performance
C20D9 Volvo 145
C20D9 Morgan Plus 4 Brake Fluid Level Sensor Input Short Circuit To Ground
C20D9 Daihatsu Gran Gear Shift Reverse Actuator Circuit / Open [rearward motion, even gears, 2,4,6]